Photosynthesis By:zachary middendorf

Photosynthesis is when green plants and other organisms use sunlight to synthesize food from carbon dioxide and water.

Step 1: First, the light energy excites electron in the photosystem. The light energy causes water molecules to split, and releases an electron into the transport system, a hydrogen ion (called a proton) Is put into the thylakoid space, and oxygen as a waste product. This breakdown id essential for photosynthesis to happen.

Step 2: The exited electron moves to the photosystem II to a electron-acceptor molecules in the thylakoid membrane.

Step 3: Next, the electron-acceptor molecules transfers the electron along a series of electron-carries to photosystem I.

Step 4: In the presence of light, photosystem I transfers the electron to the protein called ferrodoxin. The electron that is lost in photosystem I is replaced by the electrons shuttle from photosystem II.

Step 5: Lastly, ferrodovin transfers the electrons to the electron carrier NADP+, forming the energy-storage molecules NADPH.

Step 1: six carbon dioxide molecules combine with six 5-carbon compounds to form twelve 3-carbon molecules called 3- phosphoglycerate.

Step 2: the chemical energy stored in ATP and NADPH is transfered to the 3-PGA molecules to form a high-energy molecules called glyceraldehyde 3-phosphates. ATP supplies the phosphate groups to form G3P molecules and NADPH supplies hydrogen ions and electrons.

Step 3: Two G3P molecules leave the cycle to be used for the production of glucose and other organic compounds.

The final step of the calvin cycle is an enzyme called rubisco converts the last ten G3P molecules into 5-carbon molecules called ribulose 1, 5-bisphosphate. The molecules combine with new carbon dioxide molecules to continue the cycle. The sugar made from the cycle is used for energy and building blocks of complex carbohydrates.



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